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Message-Id: <20220604163000.211077-8-mailhol.vincent@wanadoo.fr>
Date: Sun, 5 Jun 2022 01:30:00 +0900
From: Vincent Mailhol <mailhol.vincent@...adoo.fr>
To: Marc Kleine-Budde <mkl@...gutronix.de>
Cc: linux-can@...r.kernel.org, linux-kernel@...r.kernel.org,
Max Staudt <max@...as.org>,
Oliver Hartkopp <socketcan@...tkopp.net>,
netdev@...r.kernel.org,
Vincent Mailhol <mailhol.vincent@...adoo.fr>
Subject: [PATCH v5 7/7] can: skb: drop tx skb if in listen only mode
Frames can be directly injected to a can driver via the packet
socket. By doing so, it is possible to reach the
net_device_ops::ndo_start_xmit function even if the driver is
configured in listen only mode.
Add a check in can_dropped_invalid_skb() to discard the skb if
CAN_CTRLMODE_LISTENONLY is set.
Signed-off-by: Vincent Mailhol <mailhol.vincent@...adoo.fr>
---
drivers/net/can/dev/skb.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/net/can/dev/skb.c b/drivers/net/can/dev/skb.c
index dc9da76c0470..8bb62dd864c8 100644
--- a/drivers/net/can/dev/skb.c
+++ b/drivers/net/can/dev/skb.c
@@ -5,6 +5,7 @@
*/
#include <linux/can/dev.h>
+#include <linux/can/netlink.h>
#include <linux/module.h>
#define MOD_DESC "CAN device driver interface"
@@ -293,6 +294,7 @@ static bool can_skb_headroom_valid(struct net_device *dev, struct sk_buff *skb)
bool can_dropped_invalid_skb(struct net_device *dev, struct sk_buff *skb)
{
const struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
+ struct can_priv *priv = netdev_priv(dev);
if (skb->protocol == htons(ETH_P_CAN)) {
if (unlikely(skb->len != CAN_MTU ||
@@ -306,8 +308,13 @@ bool can_dropped_invalid_skb(struct net_device *dev, struct sk_buff *skb)
goto inval_skb;
}
- if (!can_skb_headroom_valid(dev, skb))
+ if (!can_skb_headroom_valid(dev, skb)) {
+ goto inval_skb;
+ } else if (priv->ctrlmode & CAN_CTRLMODE_LISTENONLY) {
+ netdev_info_once(dev,
+ "interface in listen only mode, dropping skb\n");
goto inval_skb;
+ }
return false;
--
2.35.1
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